typedef enum
{
	kLineShape = 0,
	kRectShape,
	kEllipseShape,
	kImageShape
} ShapeType;

typedef enum
{
	kRedColorTab = 0,
	kBlueColorTab,
	kYellowColorTab,
	kGreenColorTab,
	kRandomColorTab
} ColorTabIndex;

#define degreesToRadian(x)	(3.14159265358979323846 * x / 180.0)